When should I use GC SuppressFinalize

Question

In  NET  under which circumstances should I use GC SuppressFinalize     What advantage s  does using this method give me

User · Answer

If a class  or anything derived from it  might hold the last live reference to an object with a finalizer  then either GC SuppressFinalize this  or GC KeepAlive this  should be called on the object after any operation that might be adversely affected by that finalizer  thus ensuring that the finalizer won t run until after that operation is complete   The cost of GC KeepAlive   and GC SuppressFinalize this  are essentially the same in any class that doesn t have a finalizer  and classes that do have finalizers should generally call GC SuppressFinalize this   so using the latter function as the last step of Dispose   may not always be necessary  but it won t be wrong

User · Answer

SupressFinalize tells the system that whatever work would have been done in the finalizer has already been done  so the finalizer doesn t need to be called   From the  NET docs      Objects that implement the IDisposable   interface can call this method from   the IDisposable Dispose method to   prevent the garbage collector from   calling Object Finalize on an   object that does not require it    In general  most any Dispose   method should be able to call GC SupressFinalize    because it should clean up everything that would be cleaned up in the finalizer   SupressFinalize is just something that provides an optimization that allows the system to not bother queuing the object to the finalizer thread  A properly written Dispose   finalizer should work properly with or without a call to GC SupressFinalize

User · Answer

SuppressFinalize should only be called by a class that has a finalizer  It s informing the Garbage Collector  GC  that this object was cleaned up fully   The recommended IDisposable pattern when you have a finalizer is   public class MyClass   IDisposable       private bool disposed   false       protected virtual void Dispose bool disposing                if   disposed                        if  disposing                                   called via myClass Dispose                        OK to use any private object references                              Release unmanaged resources                 Set large fields to null                              disposed   true                       public void Dispose      Implement IDisposable               Dispose true           GC SuppressFinalize this               MyClass      the finalizer               Dispose false             Normally  the CLR keeps tabs on objects with a finalizer when they are created  making them more expensive to create   SuppressFinalize tells the GC that the object was cleaned up properly and doesn t need to go onto the finalizer queue  It looks like a C   destructor  but doesn t act anything like one   The SuppressFinalize optimization is not trivial  as your objects can live a long time waiting on the finalizer queue  Don t be tempted to call SuppressFinalize on other objects mind you  That s a serious defect waiting to happen   Design guidelines inform us that a finalizer isn t necessary if your object implements IDisposable  but if you have a finalizer you should implement IDisposable to allow deterministic cleanup of your class   Most of the time you should be able to get away with IDisposable to clean up resources  You should only need a finalizer when your object holds onto unmanaged resources and you need to guarantee those resources are cleaned up    Note  Sometimes coders will add a finalizer to debug builds of their own IDisposable classes in order to test that code has disposed their IDisposable object properly    public void Dispose      Implement IDisposable       Dispose true    if DEBUG     GC SuppressFinalize this    endif     if DEBUG  MyClass      the finalizer       Dispose false      endif

User · Answer

That method must be called on the Dispose method of objects that implements the IDisposable  in this way the GC wouldn t call the finalizer another time if someones calls the Dispose method   See  GC SuppressFinalize Object  Method - Microsoft Docs

User · Answer

Dispose true   GC SuppressFinalize this     If object has finalizer   net put a reference in finalization queue   Since we have call Dispose ture   it clear object  so we don t need finalization queue to do this job    So call GC SuppressFinalize this  remove reference in finalization queue

[c#] When should I use GC.SuppressFinalize()?

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